Holeless Hydro
Twin Jack Holeless Car Type Summary
This design uses 2 jacks, one on each side of the car, positioned between the platform and the hoistway wall.
Single stage jacks are used for low travel, typically on 2-stop cars up to 14 ft. Two stage jacks are used for travel up to 28 to 30 feet (typically 3 to 4 stops).
Advantages
The jacks are located above ground, thereby eliminating the need to drill a jack hole and eliminating the risk of oil contamination. This car type will also accommodate low and high-capacity cars.
Disadvantages
Travel is typically restricted to a 2 -4 stop application. Depending upon the travel, an extended overhead may be required to fit the jacks into the hoistway elevation. The hoistway width requirement may also be a little greater than an in-ground car type, for high-capacity applications.
See chart below:
Low Capacity Standard Dimension & Specification Chart